Bridge crack measuring device and measuring method for municipal bridges

Abstract

The present invention provides a bridge crack measuring device and a measuring method for a municipal bridge. The measuring device comprises a panel, a driving mechanism, a laser measuring assembly and a positioning mechanism. A first guide rod is inserted into the inner side of the panel, a positioning mechanism is pressed against the bottom of the first guide rod, a moving wheel is inserted into the bottom of the positioning mechanism, and the positioning mechanism is pressed on both sides of the bridge crack to be measured through the moving wheel. A driving mechanism is installed in the middle of the panel. There are two first guide rods and two positioning mechanisms. The present invention can drive a first laser probe at the bottom to pass along the surface of the bridge crack by toggling a vertical measuring mechanism on one side through a driving mechanism, and cooperate with a translation guide mechanism to obtain the width. Therefore, during the movement of the entire device, the width data of the crack at different positions can be quickly obtained at a higher frequency through the driving mechanism, and the measurement error can be further reduced by cooperating with the translation guide mechanism and the two positioning mechanisms at the bottom for positioning.

Description

Technical Field

[0001] The invention relates to the technical field of dimension measurement, and in particular to a bridge crack measuring device and a measuring method for a municipal bridge. Background Art

[0002] Bridge cracks are an important concern in bridge maintenance and inspection. They not only affect the appearance of the bridge, but more importantly, they are related to the safety and durability of the bridge. Before repairing bridge cracks, the size of the cracks needs to be measured. The main purpose of measuring bridge cracks is to find out the crack conditions, understand their changing patterns, analyze the causes and hazards, and take appropriate measures. Through crack measurement, the impact of cracks on bridge structures can be evaluated, potential safety hazards can be discovered and dealt with in a timely manner, and data reference can be provided for subsequent maintenance.

[0003] When the bridge crack measuring device used in municipal bridges in the prior art uses laser measurement technology for measurement, if it is necessary to measure the width of the bridge crack, it is necessary to use auxiliary tools to irradiate from one side of the bridge crack to the other side of the crack to obtain the width data. However, since the widths of different areas of the crack are also different, it is necessary to obtain multiple sets of width data, which makes the measurement steps cumbersome and the workload large. At the same time, since it is difficult to ensure that the irradiated light beam is completely perpendicular to the bridge crack when collecting the width by hand, the error will also increase. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a bridge crack measuring device and a measuring method for municipal bridges, so as to solve the problems raised in the above-mentioned background technology. The present invention can drive the first laser probe at the bottom to pass along the surface of the bridge crack by toggling the vertical measuring mechanism on one side through the driving mechanism, and cooperate with the translation guide mechanism to obtain width data. Therefore, during the movement of the entire device, the driving mechanism can quickly obtain the width data of different positions of the crack at a higher frequency, thereby improving the efficiency of width acquisition, and cooperating with the translation guide mechanism and the two positioning mechanisms at the bottom for positioning can further reduce the measurement error and improve data reliability.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a bridge crack measuring device for municipal bridges, including a measuring device body, the measuring device body including a panel, a driving mechanism, a laser measuring assembly and a positioning mechanism, a first guide rod is inserted on the inner side of the panel, the bottom of the first guide rod is against the positioning mechanism, a moving wheel is inserted on the bottom of the positioning mechanism, and the positioning mechanism is pressed on both sides of the crack of the bridge to be measured through the moving wheel, a driving mechanism is installed in the middle of the panel, the number of the first guide rod and the positioning mechanism are two, and the two ends of the driving mechanism are respectively sleeved on the corresponding first guide rod surface, a laser measuring assembly is welded on the side of the driving mechanism, the laser measuring assembly includes a translation guide mechanism and a vertical measuring mechanism, a first laser probe is screwed on the bottom of the vertical measuring mechanism, a second laser probe is screwed on one end of the inner side of the translation guide mechanism, and the first laser probe is vertically irradiated toward the surface of the bridge to be measured.

[0006] Furthermore, the driving mechanism includes a motor and a rotating disk, a fixing plate is screwed on the bottom of the motor shell, an extension plate is integrally formed on the side of the fixing plate, a sliding clamp is integrally formed on the surface of the extension plate, a fixing sleeve is welded to the bottom of the fixing plate, a linkage plate is integrally formed on the side of the fixing sleeve, and a toggle plate is inserted into the side of the rotating disk.

[0007] Furthermore, a drive shaft is inserted into the output end of the motor, and the drive shaft is welded to the surface of the rotating disk. An arc surface is provided on one side of the toggle plate. A strip hole is opened on the inner side of the sliding clamp, and the sliding clamp is sleeved on the outer side of the first guide rod through the strip hole.

[0008] Furthermore, the translation guide mechanism includes a partition and a width measuring cavity, a slide groove is opened on the surface of the partition, a reset cavity is welded on the top of the partition, the end of the linkage plate is welded to the outside of the reset cavity, a width measuring cavity is opened at the bottom of the partition, and an extension bin is screwed at the front end of the width measuring cavity.

[0009] Furthermore, the top of the vertical measuring mechanism is embedded in the interior of the reset cavity, the middle of the vertical measuring mechanism passes downward from the slide groove and the interior of the width measuring cavity in sequence, and the second laser probe is installed in the interior of the extension chamber.

[0010] Furthermore, the vertical measuring mechanism includes a first laser probe and a lower hanging rod, a second guide rod is inserted into the interior of the reset cavity, a sliding sleeve is welded to the top of the lower hanging rod, a reset spring is welded to one end of the sliding sleeve, and the other end of the reset spring is welded to one end of the inner wall of the reset cavity.

[0011] Furthermore, a reflective sheet is sleeved on the surface of the lower hanging rod, the second laser probe emits a measuring laser beam toward the surface of the reflective sheet, and the lower hanging rod passes through the inside of the slide groove.

[0012] Furthermore, the positioning mechanism includes a sliding plate and a vertical plate, the vertical plate is welded to the surface of the sliding plate, the top of the vertical plate is integrally formed with a support plate, the surface of the support plate is welded with a clamping rod, and the bottom of the sliding plate is inserted with a positioning probe.

[0013] Furthermore, the positioning probe is used to be embedded in the interior of the bridge crack to be measured, and the support plate is against the bottom of the sliding clamp. Four clamping rods are installed on the top of each of the support plates, and the side edges of the clamping rods are used to push the sliding clamp.

[0014] A measuring method using the above measuring device comprises the following steps:

[0015] Step 1: Place the measuring device above the gap to be measured on the bridge;

[0016] Step 2: Control the positioning probes under the positioning mechanisms at both ends to be embedded into the gap to be measured;

[0017] Step 3: Start the driving mechanism, control the vertical measuring mechanism to perform periodic translational motion, and continuously obtain height data;

[0018] Step 4: Detect height data through the first laser probe and record the time when the height data changes;

[0019] Step 5: Using the second laser probe to record the detection distance at the moment when the height data detected by the first laser probe changes;

[0020] Step 6: Calculate the width parameter of the gap to be measured by using the two-point data continuously acquired by the second laser probe.

[0021] Beneficial effects of the present invention:

[0022] 1. The bridge crack measuring device for municipal bridges can drive the first laser probe at the bottom to pass along the surface of the bridge crack by toggling the vertical measuring mechanism on one side through the driving mechanism, and cooperate with the translation guide mechanism to obtain width data. Therefore, during the movement of the entire device, the width data of different positions of the crack can be quickly obtained at a higher frequency through the driving mechanism, thereby improving the efficiency of width acquisition.

[0023] 2. In the bridge crack measuring device used for municipal bridges, the movement of the vertical measuring mechanism is restricted by means of a translation guide mechanism. Therefore, after the driving mechanism pushes the vertical measuring mechanism in a rotating state, it can ensure that the laser probe at the bottom passes through the surface of the bridge crack in a straight line. This also makes the final measured bridge crack width a straight line width, thereby eliminating the measurement error increased by the rotation trajectory of the driving mechanism and improving data reliability.

[0024] 3. The bridge crack measuring device for municipal bridges uses two positioning mechanisms at the bottom to position the entire driving mechanism and both ends of the laser measuring component. Therefore, within the range of one end of the current bridge crack, the overall extension direction of the driving mechanism can be approximately parallel to the bridge crack at the bottom. This also makes the moving path of the first laser probe perpendicular to the extension direction of the driving mechanism also perpendicular to the bridge crack to be measured, so as to ensure that the width data obtained by the measurement is more accurate, and can also assist in guiding the movement of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the appearance of the bridge crack measuring device used for municipal bridges of the present invention;

[0026] Figure 2 It is a structural diagram of the laser measurement component part of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the translation guide mechanism part of the present invention;

[0028] Figure 4 It is a schematic diagram of the driving mechanism part of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the vertical measurement mechanism part of the present invention;

[0030] Figure 6 It is a structural diagram of the positioning mechanism part of the present invention;

[0031] Figure 7 for Figure 1 A magnified image of area A;

[0032] Figure 8 A flow chart of a bridge crack measurement method for a municipal bridge according to the present invention;

[0033] In the figure: 1. enclosure; 2. first guide rod; 3. drive mechanism; 4. laser measurement assembly; 5. positioning mechanism; 6. translation guide mechanism; 7. vertical measurement mechanism; 8. partition; 9. slide groove; 10. reset cavity; 11. linkage plate; 12. width measurement cavity; 13. extension bin; 14. motor; 15. fixed plate; 16. extension plate; 17. sliding clamp; 18. fixed sleeve; 19. drive shaft; 20. rotating disk; 21. toggle plate; 22. arc surface; 23. second guide rod; 24. reset spring; 25. sliding sleeve; 26. lower hanging rod; 27. first laser probe; 28. second laser probe; 29. ​​reflector; 30. sliding plate; 31. moving wheel; 32. positioning probe; 33. vertical plate; 34. clamping rod; 35. pushing interlayer; 36. support plate. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] See also Figures 1 to 8 The present invention provides the following technical solutions: a bridge crack measuring device for a municipal bridge, comprising a measuring device body, the measuring device body comprising a panel 1, a driving mechanism 3, a laser measuring assembly 4 and a positioning mechanism 5, a first guide rod 2 is inserted into the inner side of the panel 1, the bottom of the first guide rod 2 is pressed against the positioning mechanism 5, a moving wheel 31 is inserted into the bottom of the positioning mechanism 5, and the positioning mechanism 5 is pressed on both sides of the bridge crack to be measured by the moving wheel 31, a driving mechanism 3 is installed in the middle of the panel 1, the number of the first guide rod 2 and the positioning mechanism 5 are both two, and the two ends of the driving mechanism 3 are respectively The driving mechanism 3 is separately mounted on the surface of the corresponding first guide rod 2. A laser measuring assembly 4 is welded to the side of the driving mechanism 3. The laser measuring assembly 4 includes a translation guide mechanism 6 and a vertical measuring mechanism 7. A first laser probe 27 is screwed to the bottom of the vertical measuring mechanism 7. A second laser probe 28 is screwed to one end of the interior of the translation guide mechanism 6. The first laser probe 27 is vertically irradiated toward the surface of the bridge to be measured. The measuring device is used to measure the crack width of the bridge, and aims to efficiently obtain multiple width data at different points of the crack in the bridge, and provide a certain degree of accuracy based on the emphasis on efficient data acquisition.

[0036] When the present invention is used, the measuring device is first placed above the gap to be measured in the bridge, and the measuring device is manually adjusted to align the bridge crack to be measured at the bottom with the middle position of the device. Then, the positioning probes 32 under the positioning mechanisms 5 at both ends are manually controlled to be embedded into the inside of the gap to be measured. At this time, the sliding clamping plate 17 at the measuring end of the top driving mechanism 3 is pushed and guided by the positioning mechanism 5, so that the straight line where the extension plate 16 is located is approximately parallel to the direction where the bridge crack at the bottom is located; the driving mechanism 3 is started, and the toggle plates 21 on both sides are driven to rotate with the help of the rotating disk 20 at the bottom. After the toggle plates 21 rotate, they will hit the lower hanging rod 26 in the vertical measuring mechanism 7, and push the lower hanging rod 26, so as to control the first laser probe 27 at the bottom to move. The first laser probe 27 detects the height data and records the time when the height data changes. The second laser probe 28 records the detection distance when the first laser probe 27 detects the height data changes. When the first laser probe 27 passes through the bridge crack from one side of the bridge crack, the height data collected by it will increase first and then decrease, that is, there will be two rapid changes in the height data. The second laser probe 28 continuously obtains the difference in distance between the reflector 29 and the first laser probe 27 when the data of the first laser probe 27 changes rapidly twice. The difference is the width data of the bridge crack passed by the first laser probe 27 at this time.

[0037] In this embodiment, the driving mechanism 3 includes a motor 14 and a rotating disk 20. A fixing plate 15 is screwed to the bottom of the housing of the motor 14. An extension plate 16 is integrally formed on the side of the fixing plate 15. A sliding clamp 17 is integrally formed on the surface of the extension plate 16. A fixing sleeve 18 is welded to the bottom of the fixing plate 15. A linkage plate 11 is integrally formed on the side of the fixing sleeve 18. A toggle plate 21 is inserted on the side of the rotating disk 20. A driving shaft 19 is inserted at the output end of the motor 14. The driving shaft 19 is welded to the surface of the rotating disk 20. An arc surface 22 is provided on one side of the toggle plate 21. A strip hole is opened on the inner side of the sliding clamp 17, and the sliding clamp 17 is sleeved on the outer side of the first guide rod 2 through the strip hole. By moving the vertical measuring mechanism 7 on one side through the driving mechanism 3, the first laser probe 27 at the bottom can be driven to move along the surface of the bridge crack, and the width data can be obtained by cooperating with the translation guide mechanism 6. Therefore, during the movement of the entire device, the width data of different positions of the crack can be quickly obtained at a higher frequency through the driving mechanism 3, thereby improving the efficiency of width collection.

[0038] Specifically, when the driving mechanism 3 is started, the motor 14 is first controlled to rotate, and the motor 14 drives the driving shaft 19 at the bottom to rotate, and then drives the rotating disk 20 and the toggle plates 21 on both sides to rotate. When the toggle plate 21 rotates, it can press against one side of the lower hanging rod 26 through the arc surface 22 on one side, so that the vertical measuring mechanism 7 is controlled to move along the slide groove 9, and as the toggle plate 21 continues to rotate, since the vertical measuring mechanism 7 moves along the slide groove 9 in a straight line, the toggle plate 21 will eventually pass over the lower hanging rod 26, and the reset spring 24 can be used to pull the entire vertical measuring mechanism 7 for reset processing at the moment of passing.

[0039] In this embodiment, the translation guide mechanism 6 includes a partition 8 and a width measurement cavity 12. The surface of the partition 8 is provided with a slide groove 9. A reset cavity 10 is welded on the top of the partition 8. The end of the linkage plate 11 is welded to the outside of the reset cavity 10. The bottom of the partition 8 is provided with a width measurement cavity 12. The front end of the width measurement cavity 12 is screwed with an extension bin 13. The top of the vertical measurement mechanism 7 is embedded in the reset cavity 10. The middle of the vertical measurement mechanism 7 passes downward from the slide groove 9 and the width measurement cavity 12 in turn. The second laser probe 28 is installed in the extension bin 13. The vertical measurement mechanism 7 includes a first laser probe 27 and a lower hanging rod 26. The reset cavity 10 is interspersed with a second guide rod 23. The top of the lower hanging rod 26 is welded with a sliding sleeve 25. One end of the sliding sleeve 25 is welded with a reset spring 24. The other end of the reset spring 24 is welded to one end of the inner wall of the reset cavity 10. The surface of the lower hanging rod 26 is sleeved with a reflective sheet 29, and the second laser probe 28 emits a measuring laser beam toward the surface of the reflective sheet 29, and the lower hanging rod 26 passes through the inside of the slide slot 9. The translation guide mechanism 6 is used to limit the movement of the vertical measuring mechanism 7, so after the driving mechanism 3 pushes the vertical measuring mechanism 7 in a rotating state, it can ensure that the bottom laser probe passes through the surface of the bridge crack in a linear moving state, which makes the final measured bridge crack width a linear width, thereby eliminating the measurement error increased by the rotation trajectory of the driving mechanism 3 and improving data reliability.

[0040] Specifically, when the vertical measuring mechanism 7 is driven to move by the above-mentioned driving mechanism 3, the first laser probe 27 at the bottom can pass through the surface of the bridge crack. When the first laser probe 27 passes through the inside of the bridge crack from one side of the bridge crack, the height data collected by it will increase significantly in an instant, and then restore to the numerical state of irradiating the bridge surface at the moment of passing through the bridge crack, that is, there are two rapid changes in height data. Then, during the above-mentioned data change process, the second laser probe 28 continuously obtains the distance difference of the reflector 29 detected when the above-mentioned first laser probe 27 has two rapid data changes. The difference is the width data of the bridge crack passed by the first laser probe 27 at this time.

[0041] In this embodiment, the positioning mechanism 5 includes a sliding plate 30 and a vertical plate 33, the vertical plate 33 is welded on the surface of the sliding plate 30, a support plate 36 is integrally formed on the top of the vertical plate 33, a clamping rod 34 is welded on the surface of the support plate 36, and a positioning probe 32 is inserted at the bottom of the sliding plate 30. The positioning probe 32 is used to be embedded in the interior of the bridge crack to be measured, the support plate 36 is against the bottom of the sliding clamp plate 17, and four clamping rods 34 are installed on the top of each of the support plates 36, and the side of the clamping rod 34 is used to push the sliding clamp plate 17. The two positioning mechanisms 5 at the bottom are used to position the entire drive mechanism 3 and the two ends of the laser measurement component 4, so that within the range of one end of the current bridge crack, the overall extension direction of the drive mechanism 3 is approximately parallel to the bridge crack at the bottom, which also makes the moving path of the first laser probe 27 perpendicular to the extension direction of the drive mechanism 3 also perpendicular to the bridge crack to be measured, so as to ensure that the width data obtained by measurement is more accurate, and at the same time, it can also assist in guiding the movement of the device.

[0042] Specifically, since the positioning laser at the bottom is embedded into the interior of the bridge crack through the positioning probe 32 below, a small area of ​​the bridge crack corresponding to the two positioning mechanisms 5 and the two positioning probes 32 at the bottom change the positions of the two positioning mechanisms 5. This change will also drive the sliding clamp 17 at the top to slide along the first guide rod 2 through the vertical plate 33 and the clamping rod 34. Therefore, the extension plates 16 at both ends of the driving mechanism 3 can be adjusted synchronously with the connecting line between the two positioning mechanisms 5 at the bottom. Finally, the straight line where the extension plate 16 is located is parallel to the connecting line between the two positioning mechanisms 5 (that is, the connecting line of the bridge crack to be measured intercepted between the two positioning mechanisms 5), so that the slide groove 9 perpendicular to the extension plate 16 can also be perpendicular to the connecting line of the bridge crack to be measured intercepted between the two positioning mechanisms 5. This vertical state allows the slide groove 9 to be approximately perpendicular to this section of the bridge crack. Therefore, the path of the subsequent bottom first laser probe 27 passing through the surface of the bridge crack can also be more inclined to the vertical state, so that the measured width data is more effective and reliable.

[0043] This embodiment also provides a measurement method using the above-mentioned measurement device, comprising the following steps:

[0044] Step 1: Place the measuring device above the crack of the bridge to be measured, and manually adjust the measuring device to align the crack of the bridge to be measured at the bottom with the middle position of the device;

[0045] Step 2: Manually control the positioning probe 32 under the positioning mechanisms 5 at both ends to be embedded into the inside of the gap to be measured. At this time, the sliding clamp 17 at the measuring end of the top driving mechanism 3 is pushed and guided by the positioning mechanism 5, so that the straight line where the extension plate 16 is located is approximately parallel to the direction where the bottom bridge crack is located;

[0046] Step 3: Start the driving mechanism 3, and use the rotating disk 20 at the bottom to drive the toggle plates 21 on both sides to rotate. After the toggle plates 21 rotate, they will hit the lower hanging rod 26 in the vertical measurement mechanism 7, and push the lower hanging rod 26, control the first laser probe 27 at the bottom to move in translation, and control the vertical measurement mechanism 7 to perform periodic translation movement, and continuously obtain height data;

[0047] Step 4: Detect height data by the first laser probe 27, and record the time when the height data changes. When the first laser probe 27 does not move over the bridge crack, the height data detected by the first laser probe 27 always changes only slightly. Only when it moves into the bridge crack, a large height data change will occur instantly.

[0048] Step 5: The second laser probe 28 records the detection distance at the moment when the height data detected by the first laser probe 27 changes. When the first laser probe 27 passes through the bridge crack from one side of the bridge crack, the height data collected by it will first increase and then decrease, that is, there will be two rapid changes in the height data;

[0049] Step 6: Continuously obtain the distance difference of the reflective sheet 29 detected by the second laser probe 28 when the data of the first laser probe 27 changes rapidly twice. The difference is the width data of the bridge crack passed by the first laser probe 27 at this time.

[0050] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A bridge crack measuring device for a municipal bridge, comprising a measuring device body, characterized in that: The measuring device body comprises a panel (1), a driving mechanism (3), a laser measuring assembly (4) and a positioning mechanism (5); a first guide rod (2) is inserted into the inner side of the panel (1); the bottom of the first guide rod (2) is pressed against the positioning mechanism (5); a moving wheel (31) is inserted into the bottom of the positioning mechanism (5); and the positioning mechanism (5) is pressed against two sides of a crack in a bridge to be measured via the moving wheel (31); a driving mechanism (3) is installed in the middle of the panel (1); the first guide rod (2) and the positioning mechanism (5) are The number of the driving mechanisms (3) is two, and the two ends of the driving mechanism (3) are respectively sleeved on the surface of the corresponding first guide rod (2). A laser measurement assembly (4) is welded to the side of the driving mechanism (3). The laser measurement assembly (4) comprises a translation guide mechanism (6) and a vertical measurement mechanism (7). A first laser probe (27) is screwed to the bottom of the vertical measurement mechanism (7). A second laser probe (28) is screwed to one end of the interior of the translation guide mechanism (6). The first laser probe (27) is irradiated vertically toward the surface of the bridge to be measured.

2. The bridge crack measuring device for municipal bridges according to claim 1 is characterized in that: The driving mechanism (3) comprises a motor (14) and a rotating disk (20); a fixing plate (15) is screwed to the bottom of the housing of the motor (14); an extension plate (16) is integrally formed on the side of the fixing plate (15); a sliding clamp (17) is integrally formed on the surface of the extension plate (16); a fixing sleeve (18) is welded to the bottom of the fixing plate (15); a linkage plate (11) is integrally formed on the side of the fixing sleeve (18); and a toggle plate (21) is inserted into the side of the rotating disk (20).

3. The bridge crack measuring device for municipal bridges according to claim 2 is characterized in that: A drive shaft (19) is inserted into the output end of the motor (14), and the drive shaft (19) is welded to the surface of the rotating disk (20). An arc surface (22) is provided on one side of the shifting plate (21). A strip hole is provided on the inner side of the sliding clamping plate (17), and the sliding clamping plate (17) is sleeved on the outer side of the first guide rod (2) through the strip hole.

4. The bridge crack measuring device for municipal bridges according to claim 2 is characterized in that: The translation guide mechanism (6) comprises a partition (8) and a width measuring cavity (12); a slide groove (9) is provided on the surface of the partition (8); a reset cavity (10) is welded to the top of the partition (8); the end of the linkage plate (11) is welded to the outside of the reset cavity (10); a width measuring cavity (12) is provided at the bottom of the partition (8); and an extension bin (13) is screwed to the front end of the width measuring cavity (12).

5. The bridge crack measuring device for municipal bridges according to claim 4 is characterized in that: The top of the vertical measuring mechanism (7) is embedded in the interior of the reset cavity (10), the middle of the vertical measuring mechanism (7) passes downward from the slide groove (9) and the interior of the width measuring cavity (12) in sequence, and the second laser probe (28) is installed in the interior of the extension chamber (13).

6. The bridge crack measuring device for municipal bridges according to claim 4, characterized in that: The vertical measurement mechanism (7) comprises a first laser probe (27) and a lower hanging rod (26); a second guide rod (23) is inserted into the interior of the reset cavity (10); a sliding sleeve (25) is welded to the top of the lower hanging rod (26); a reset spring (24) is welded to one end of the sliding sleeve (25); and the other end of the reset spring (24) is welded to one end of the inner wall of the reset cavity (10).

7. The bridge crack measuring device for municipal bridges according to claim 6, characterized in that: The surface of the lower hanging rod (26) is sleeved with a reflective sheet (29), the second laser probe (28) emits a measuring laser beam toward the surface of the reflective sheet (29), and the lower hanging rod (26) passes through the interior of the slide groove (9).

8. The bridge crack measuring device for municipal bridges according to claim 2, characterized in that: The positioning mechanism (5) comprises a sliding plate (30) and a vertical plate (33), wherein the vertical plate (33) is welded to the surface of the sliding plate (30), a support plate (36) is integrally formed on the top of the vertical plate (33), a clamping rod (34) is welded to the surface of the support plate (36), and a positioning probe (32) is inserted into the bottom of the sliding plate (30).

9. The bridge crack measuring device for municipal bridges according to claim 8, characterized in that: The positioning probe (32) is used to be embedded in the interior of the bridge crack to be measured, and the support plate (36) is against the bottom of the sliding clamp plate (17). Four clamping rods (34) are installed on the top of each of the support plates (36), and the side edges of the clamping rods (34) are used to push the sliding clamp plate (17) in a fit.

10. A measurement method using the measurement device according to claim 1, characterized in that: The following steps are involved: Step 1: Place the measuring device above the gap to be measured on the bridge; Step 2: Control the positioning probes under the positioning mechanisms at both ends to be embedded into the gap to be measured; Step 3: Start the driving mechanism, control the vertical measuring mechanism to perform periodic translational motion, and continuously obtain height data; Step 4: Detect height data through the first laser probe and record the time when the height data changes; Step 5: Using the second laser probe to record the detection distance at the moment when the height data detected by the first laser probe changes; Step 6: Calculate the width parameter of the gap to be measured by using the two-point data continuously acquired by the second laser probe.

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